Assertion failed bug

#include <opencv2/core/core.hpp>
#include <opencv2/imgproc/imgproc.hpp>
#include <opencv2/highgui/highgui.hpp>

using namespace cv;


int main( int argc, char** argv )
{
    namedWindow( "Display window", WINDOW_AUTOSIZE );

    Mat result;

    Mat R = imread("C:\\Lenna.png", CV_LOAD_IMAGE_GRAYSCALE);
    Mat G = imread("C:\\Lenna.png", CV_LOAD_IMAGE_GRAYSCALE);
    Mat B = imread("C:\\Lenna.png", CV_LOAD_IMAGE_GRAYSCALE);

    // Changing colors for final result that should look largely blue
    R = 0.1*R;
    G = 0.1*G;
    B = 1.5*B;

    std::vector<cv::Mat> array_to_merge ;

    array_to_merge.push_back(B);
    array_to_merge.push_back(G);
    array_to_merge.push_back(R);

    // HERE an assertion failed error happens in release mode only
    //cv::merge(array_to_merge,result);

    // This however does not cause any debug or release crash
    cv::merge(&array_to_merge[0], array_to_merge.size(), result);


    cv::imshow( "Display window", result );
    cv::waitKey(0);
}